Twist Sensor Based on Long Period Grating and Tilted Bragg Grating Written in Few-Mode Fibers

Twist Sensor Based on Long Period Grating and Tilted Bragg Grating Written in Few-Mode Fibers

A twist sensor based on a few-mode long period grating (LPG) and a tilted fiber Bragg grating (TFBG) is proposed and demonstrated. The LPG, inscribed in a step index few-mode fiber by a CO<sub>2</sub> laser, is utilized to excite the LP<sub>11</sub> core mode. The followed TF...

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Bibliographic Details
Main Authors: Kang Yang, Yange Liu, Zhi Wang, Yan Li, Ya Han, Hongwei Zhang
Format: Article
Language:English
Published: IEEE 2018-01-01
Series:IEEE Photonics Journal
Subjects:
Fiber optics
twist sensor
tilted fiber Bragg grating
long period grating
Online Access:https://ieeexplore.ieee.org/document/8333688/
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Summary:A twist sensor based on a few-mode long period grating (LPG) and a tilted fiber Bragg grating (TFBG) is proposed and demonstrated. The LPG, inscribed in a step index few-mode fiber by a CO<sub>2</sub> laser, is utilized to excite the LP<sub>11</sub> core mode. The followed TFBG written in graded index a few mode fiber with the LP<sub>11</sub> core mode as exciting light is served as sensing element. By analyzing transmitted intensity difference of two dips in transmission spectrum of the TFBG induced by the mode couplings from forward-propagating LP<sub>11</sub> core mode to backward-propagating LP<sub>11</sub> and LP<sub>21</sub> core modes, a twist sensitivity of 1.074 dB&#x002F;(rad&#x002F;m) from &#x2212;5.23&#x00A0;rad&#x002F;m to 5.23&#x00A0;rad&#x002F;m is achieved. The proposed sensor has advantages of easy operation and simple structure.
ISSN:1943-0655

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